In very much conventionally tonal music, harmonic analysis will reveal a broad prevalence of the primary (often triadic) harmonies: tonic, dominant, and subdominant (i.e., I and its chief auxiliaries a 5th removed), and especially the first two of these.

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In western European tonal music of the 18th and 19th centuries, the tonic center was the most important of all the different tone centers which a composer used in a piece of music, with most pieces beginning and ending on the tonic, usually modulating to the dominant (the fifth above the tonic, or the fourth note down from the tonic) in between.

This can be seen another way. Each minor scale uses exactly the same set of notes (key signature) as some major scale and vice-versa. The only difference is which of these notes functions as the tonal center — which of them is the tonic. For example, C major and A minor have no sharps or flats. Consequently, the tonic plays an important part in determining why music composed using a minor mode sounds different from music composed using a major mode.

A tonic may be considered a tonal center, while a pitch center functions referentially or contextually in an atonal context, often acting as axis or line of symmetry in an interval cycle.[5]Pitch centricity was coined by Arthur Berger in his "Problems of Pitch Organization in Stravinsky".[6]

The tonicdiatonic function includes four separate activities or roles as the principal goal tone, initiating event, generator of other tones, and the stable center neutralizing the tension between dominant and subdominant.

After tonic, the names of the remaining scale degrees (of a diatonic scale) in order are as follows:supertonic — second scale degree (the scale degree immediately "above" the tonic);mediant — third scale degree (the "middle" note of the tonic triad);subdominant — fourth scale degree (a fifth "below" the tonic);dominant — fifth scale degree (the most "pronounced" harmonic note after the tonic);submediant — sixth scale degree (the "middle" note of the subdominant triad);leading tone (or leading note) — seventh scale degree (the scale degree that "leads" to the tonic, this is also referred to as subtonic);subtonic - also seventh scale degree, but applying to the lowered 7th found in the natural minor scale.